Instructions for Testing Your Home

Where Should a Detector Be Placed?

Radon levels vary considerably from location to location in the same building.  Radon frequently enters from the soil underneath the basement or slab, and radon levels are usually highest in the lowest level of the building.

The US EPA uses the terms "lowest level ... suitable for occupancy ... without renovations" in recommending a location to test for radon.  If you have a lowest level with a bedroom, office or family room, you should set up your radon detector in one of these rooms.  If you rarely use the lowest level in your home, you may wish to place an additional detector in a frequently used room on the next lowest level.

Place a radon detector in the breathing zone, 2-6 feet above the floor, and away from drafts, exterior walls, sumps, drains, windows or doors.  Radon may enter a building through cracks in the foundation or through sumps or drains and will usually be higher near these entry points.  More detailed instructions are included with each RSSI Alpha-track radon test kit.

Starting Your Test

  • Read the placement instructions for your radon detector and choose a test location

  • Remove the Alpha-track detector from its protective pouch

  • Write the start date on the radon detector

  • If you plan to hang the detector, firmly slide the hook into the groove on the bottom of the detector

  • Leave the radon detector in one place for the entire test period

  • Save the information form and the return mailer box

Ending Your Test

  • Write the end date on the radon detector

  • Fill out the Data Card Form

  • If you lost your Data Card form you can Download an RSSI Consumer Data Card Form

  • Be sure to keep a record of your radon detector number

  • Do NOT tape up the radon detector or put it in a bag or pouch

  • Place the radon detector and the information form in the return mailer box

  • If you lost your mailer, use a padded envelope or small cardboard box and mail it to the address on the detector

  • Be sure the mailer or envelope is sealed

  • RSSI does not recommend testing for periods shorter than a month. For tests 15 days or longer, the return mailer is acceptable for return shipping.  For tests 8 to 14 days long, detectors must be be sent overnight to RSSI.  (Note: If not using the business reply label, shipments to RSSI should not have deliveries scheduled for Saturday or Sunday.)

Getting Your Results

  • Your radon detector will be analyzed within seven business days of its arrival at the lab.

  • Results are available on-line by entering your detector number.

  • A written report will be sent to you via mail or email.


General Radon Information

Product Information

Form Downloads

Order Radon Test Kits

Check Your Results 

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